I know Jay has toyed with the idea of a Nova Bomb as a means to disrupt the stalemate that can often bog down the end of games. I have a different suggestion. Just an early idea, and I haven’t tried to write up any kind of formula.
A Slingshot would be built at a star, similar to a Warp Gate. However, it would not require a corresponding structure at the destination. Instead, it would be used to throw ships a great distance and with high speed to disrupt and destroy enemy fleets and infrastructure.
Range 1.5-2x current Hyperspace Range distance. Speed would be 5x to 10x normal travel speed. When the ships arrive at the target star, they are traveling like a meteor storm, and will obliterate a portion of any orbiting fleet. Orbiting fleet size, scanning and weapon level also determines how much of the incoming attack is able to be destroyed before it impacts with infrastructure. The attack has the ability to destroy Gates, Econ, Industry and Science on the star. Possibly even reducing the NR of a star.
An actual formula would need to be devised, but my thinking is this:
Scanning and Weapons levels could each give a small percentage bonus to the fleet in orbit, improving their chance of shooting the incoming projectiles before they reach the fleet and infrastructure. The more ships in orbit, the better chance of intercepting the incoming ships, but also more likely that multiple ships will be destroyed by a single incoming ship. Not all the ships in orbit would necessarily be destroyed,
For every X ships getting past the defending fleet, 1 random infrastructure is destroyed. If all infrastructure is destroyed, then 5 points of resources are removed. Apply the Resource damage to the Natural Resources, with the limit being a reduction to 1NR.